Safe lock



Patented Feb. 14, 1928.

UNITED srarsis HERBERT e. MARTIN, or minwiiunsnwrsoonsm.

SAFE Loon.

Apphcation filed This invention relates to locks, and particularly directed to safe lock.

It frequently happens that sates are locked with one of the bank employees willy in the safe. This condition is a gravated by the fact that it also frroucn' that the man looked within the safe is only one who knows the combination safe and thus his lGlTl'lOVdlTfl n thes a accomplished only with. extreme diliiculty.

This invention is designed to overcome the defects noted above and objects of such invention are to provide a novel form of safe lock which is so constructed that it may be operated from the inner side by normally removed means capable of application to the standard lock as an attachment and to construct the means so that a slight difference exists between. the setting; of the outer and inner dials, such difference being); a permanent amount and known to the operator who knows the combination of the safe.

Further objects are to provide a very simple form of attachment which may be applied to standard looks with a. minimum alteration of the lock it being m ly necessary to drillv a few holes in the c sing of. the lock and to position the device thereon An en'ihodiment of the invention is shown in the accon'ipanying drawings in which:

Figure 1 is a fragmentary view showina' a section tl'lIOllQll a safe door diagrammatially. and showing a safe lock with parts broken away and with the attachment in place and partly in section;

33 of Figure 1;

Figure 4 is a rear view of the structure shown in Figure 1:

Figure 5 is a sectional detail showing the attachment in place. 7

Referring to the drawings, it will be seen that a safe door 1 has been shown as equipped with a tumbler lock, the casing 2 thereof being secured to the inner side of the door. This lock is operated by means of a tumbler shaft 3 projecting through the March 142. 1927.

semi No. 175,258.

discs and projects slightly. beyond the last disc 6. the rear cud of the key beingindicatcd by the reference character 7. The cats m'z' has a hole drilled therein in alignment with the tumblershaft, as shown in .lfigure l, and a circular cup ti is secured in place in any suitable manner, osby means of rivets, as shown in Figure l.

notch u in one portion thereof, as shown in lug-ore 4r, forthe starting point. This cup This cup-shaped member 1S provided with a graduation or la normally receives a closure plate 9 removably held therein, preferably by means of a split sleeve 10 inserted through the aperture in the cup and the aperture in the easthe loci; as shown in Figure 2. if :his removable place may be providl a handle ll. This plate is used merely to close the cup and the aperture and he p dust out of the loch; under normal conditicns. The lliltihfllllltlll', comprises a dial 1.2 graduated similarly to the dial 5 andprovided witha short hub id, as i'i'iostclearly short: 1 l l iqure lin extension sleeve l-l is pini'ied to the hub 13 and is slotted at one point for the reception of the end of thekey This d'al 12 is thus rigid with the exten sion lccve and is adapted for operative connection with the tun'ibler shaft at the rear of the loch" by merely removing the plate 5) a d inserting the device, as shown in .lfiggure l. The dial 12 is provided with a manipulating; knob 15, as indicated.

lu making the attachment, the sleeve 14 is positioned upon the hub 13 and the two dials 5 ant 12 are turned out of register by a predetermined amount, for example ten points, as indicated in Figure 1. Thereafter a hole drilled through the sleeve 14 and the hub 13, and a pin 16 is driven into place thus permanently lockin the sleeve to the dial and holding the dial 12 in a predetermined relation to the dial 5 when the device is in operative position. This mode of construction is followed as the position of the ke 7 frequently varies with reference to the diiil 5 and by means of the construction safe door and provided with a. manipulatnormally is removed from the lock and is ing knob 4 and a graduated dial 5. Ordinarily, as in the standard construction this tumbler shaft is keyed to one of the adopted for cooperative attachment thereto .vhen required, and it will be seen further that due to the offsetting of the scale of one dial with reference to the scale of the other dial, that a device has been provided which can not be freely manipulated by anyone to open the lock, but can be manipulated only by one apprised of this difference in setting of the two dials.

It will be seen further that the attachment can be readily applied to standard safe looks with a minimum of change to the lock as all that is necessary is to drill. the cover at the casing and position the parts as described.

Although the invention has been described in considerable detail, such description is intended as illustrative rather than limiting as the invention may be variously embodied and as the scope of such invention is to be determined as claimed.

I claim:

1. The combination of a safe lock provided with a tumbler shaft, a casing surroundingsaid lock and having a hole therein in alignment with the tumbler shaft. a main dial carried by the outer end of said tumbler shaft, and an auxiliary dial having a sleeve adapted for positioning through the aperture in said casing, said sleeve and the rear end 0t said tumbler shaft having cooperating portions tor o 'ieratively connecting said shaft and said sleeve.

2; The combination of a safe lock provided with a tumbler shaft, a casing surrounding said lock and having a hole therein in alignment with the tumbler shaft, a main dial carried by the outer end of said tumbler shaft, and an auxiliary dial having a sleeve adapted for positioning through the aperture in said casing, said shaft having a key therein and said sleeve having a notch :ulapted to receive said key.

23. The combination of a safe loch provided with a tun'xbler shaft, a casing surrounding said lock and having a hole therein in alignment with the tumbler shaft, a main dial carried by the outer end of said tumbler shaft, and an auxiliary dial having a sleeve adapted for positioning through the aperture in said :asing, said sleeve and the rear end of said tumbler shaft. having cooperating portions for operatively connecting said shaft and said sleeve, said dials having graduations thereon with the graduations off one dial oiiset a. predetermined amount with reference to the scale oi the other dial.

l. The colnl'iiuation of a sale provided with a tumbler lock having a tuinb er shalt provided with an outer manipulating member equipped with a dial, said lock having a casing provided with an aperture, a cupshaped member secured to the rear face of said casing adjzu'ent said aperture, and a removable attachment provided with a manipulating knob and a dial attached tor positioning within said cup-shaped member, said attaclnnent having a sleeve adapted to project through said aperture, said sleeve and said tumbler shaft having interengaging parts to position one dial at a predeterininei'l,

angular setting with referenceto the other dial.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of lililwaukee and State of Wisconsin.

HE {BERT Q. liilARTlN. 

